US1512190A

US1512190A - Bearing and method of making the same

Info

Publication number: US1512190A
Application number: US683256A
Authority: US
Inventors: Edward A Barnes
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1923-12-28
Filing date: 1923-12-28
Publication date: 1924-10-21
Anticipated expiration: 1941-10-21

Description

Oct. 21. 1924. 1,512,190

E. A. BARNES BEARING AND METHOD OF MAKING THE SAME Filed Dec. 28. 1923 Inverter: Edward A13 arnes,

Patented @ct. 21, 1924.

EDWARD A. BARNES, OF FOE-'1 WAYNEINDI ANA, ASSIGNOR T O GENERAL COMPANY, A CORPORATION OF NEW YOIll-K.

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ELECTRIC BEARING AN D METHOD OF MAKING THE SAME.

Application filed December 28, 1923. Serial No. 683,256.

To all whom it may concern:

Be it known that I, EDWARD A. BARNES,

.a citizen of theUnited States, residing at Fort Wayne, in the county of Allen, State of Indiana, have invented certain new and useful Improvements in Bearings and Methods of Making the Same, of which thefollowing is a specification.

My invention relates to bearings for rotating shafts, and has for its object to provide an improved composite bearing struc-' ture and an improved method of making the same.

In the 'past the great majority of bearings for electric motors has been madeby the casting'process which consists in pouring the molten bearing metal into an outer shell and permitting it to solidify. Bearing metals when cast in this manner are characterized by a moreor'less granular structure which is short and brittle. This, therefore, necessitates considerable care and skill on the part of the operator in order to insure that the bearing metal after being cast is of propercharaoter, suitable for a bearing surface, and not changed to an unsuitable character by the heating and cooling of the metal when cast. After the metal is cast in the outer shell there is the further operation 30 which must be performed to make the hearing suitable for use, that is, the bearing sur face must be finished off and the oil grooves cut therein.

It has been proposed to make composite bearings by pressin an outer shell and an inner lining of col drawn metal together to produce a bearing having a bearing surface of known characteristics. Bearings made by this latter method, if provided with oil grooves, must of necessity have a lining of considerable thickness to permit oil rooves of suificient depth to be cut into the 'ining.

In accordance with my invention, I provide an outer shell-or casing with grooves on its inner surface and expand a relatively thin lining of suitable bearin material into the shell and grooves for t e purpose of forming the bearing.

Other features of novelty which charac terize my invention are pointed out with particularity in the claims annexed to and forming a part of this specification:

For a' better understanding of my invention, reference may be had to. the :ft'ollowing description taken in connection with the accompanying drawing, in which Fig. 1 is a side view of the shell used in constructing a bearing in accordance with my invention; Fig. 2 is a side View of the inner lining; Fig. 3 is a side view 'of the completed bearing; Fig. 4 is a sectional view of the completed bearing taken along lines 41-4 of Fig. 3, and Fig. 5 shows one type-of expanding means which can be used to carry out the processv of my invention.

As illustrated, the bearing made in accordance with my invention is composed of anouter shell or casing 10 having grooves and recesses 11 formed on its inner surface and an. inner tube or lining 12' of suitable bearing material expanded therein. The outer shell 10 can be of any suitable material either cast or wrought. If cast, the grooves 11 can be formed during the casting operation. These grooves and recesses 11 are made of suflicient de th and width to permit the lining 12 w en expanded to conform to their contour and allow sufiieient space between the surface of the lining 12 and the shaft, to form oil passages.

After the shell 10 has been prepared as suggested above, the lining 12 is inserted and'expanded into intimate contact with the inner surface of the outer shell 10. The lining 12 by this operation is c-uased to con- .form to the-contou of the inner surface of the shell 10 and provide a bearing surface having oil grooves. manufacture, the oil grooves will be formed with rounded edges which will prevent'them .from scraping the oil from the journal.

' The expanding operation can be carried .out by the use of expanding mandrels, compressed air, hydraulic pressure or any other simple mechanical expanding means. In Fig. 5, of the drawing, I have illustrated a special means for expanding the lining 12 into the casing 10. An abutment 15 is provided with a soft rubber or similar facing 16 against which the shell 10 and lining 12 are placed. A plunger 17 projects into the By this method of lining 12 and is. provided with a shoulder 18 shaving alsoft rubber gasket 19 which completely seals the interior of the lining 12.

The plungerl'? is provided with an opening adapted, when expanded, to force the lining 12 into intimate contact with the; shell 10.

After the lining 12 has been expanded into the shell 10 and the pressure is released the bulb 21 will contract and it can then be withdrawn from the completed bearing and be ready to be inserted into the next hearing and perform the sameduty.

' "Since the lining 12 is expanded into the grooves and recesses 11, they will serve the double function of anchoring the lining metal 12 to the shell 10 and. at thesame time produce the desired oil passages on the bearing surface. The lining 12 can be composed of any suitable bearing metal. Some of the metals which I have found to be satisfactory are a copper base alloy,

"composed of copper, 5% vtin and 5% lead; a tin base alloy, composed of 897. tin, 3.55% copper and 7.5% antimony; and a lead base alloy composed of 78% 'to 80% lead, 15 to 18% antimony and 3.5% to 6% tin. Metals of the above class can be obtained in the desired shape, in the open market, or can be' produced by working and drawing the metal over arbors. and through dies to form them to the desired shape and thickness. This working and drawing elongates the granular structure of the 'metal, together with the internal strains,

distortions and irregularities incident to such operations. Moreover, these hearings of composite character can be made by combining metals having the different characteristics required for the duty of the lin-- ing in relation to a journal, and for the duty of the shell' in relation to the lining and to the holding means.

My invention may be embodied in many other forms than that shown and described and I, therefore, do not wish to be restricted to the precise embodiment shown or method described, but intend to cover by the appended claims all changes and modifications 'which' are within the scope of my invention a lining of bearing metal, having a uniform thickness, into conformity with the inner surface of said shell and grooves.

2. Themethod of making a composite bearing which consists in cutting grooves in a rigid outer shell and expanding a hearing metal lining. of uniform thickness, into conformity with the inner surface of said outer shell and grooves. said lining having a thickness less than the depth of said grooves.

3. The method of making a composite bearing which consists in providing an outer seamless shell with grooves on its inner' surface and expanding a seamless tube of bearing metal, having a uniform thickness, into conformity with the inner sur: face of said outer shell to 'form a bearing surface having oil grooves therein.

4. The method of making a composite hearing which comprises cold pressing together an outer shell having grooves on its inner surface and an inner tube of different metal, of uniform thickness, 'and causing said inner tube to conform with the inner surface of said outer shell tosecu're the parts together and form a bearing having oil grooves.

5. A bearing for rotating shafts comprising an outer shell having grooves formed therein, and a metal lining within said outer shell conforming to the inner surface of said outer shell and grooves, said lining having a substantially uniform thickness.

6. A composite bearing comprising an outer rigid shell having grooves formed therein, and a lining of uniform thickness within and conforming to the inner surface of said shell to form a bearing surface having oil grooves therein. i

7. A composite bearing comprising an outer rigid shell having grooves formed therein, arid a lining of uniform thickness within said shell conforming with said grooves to form oil passages in said bearing. In witness whereof, lthave hereunto set my hand this 26th day of Decem er, 1323. EDWARD A.- BA NES.